function foo() {
  console.log(this)
}


// foo.call("aaa")
// foo.call("aaa")
// foo.call("aaa")
// foo.call("aaa")

var newFoo = foo.bind("aaa") // 显示绑定了aaa，显示绑定>隐式绑定
newFoo()
newFoo()
newFoo()

var bar = foo
console.log(bar === foo)
console.log(newFoo == foo)
